The First Known Case of Blood Group Chimerism in Monochorionic Dizygotic Twins in Korea
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Dear Editor, Monochorionic (MC) dizygotic twins (DZT) are rarely conceived naturally [1]. However, the number of pregnancies conceived by assisted reproductive technology (ART) has increased from 9,864 in 1994 to 29,733 in 2006, thus multiple birth rate in- creased from 10/1,000 live births in 1980’s to 27.5/1,000 live births in 2008 in Korea [2]. All MC DZT are theoretically chime- ric for blood cells because blood stem cells might be exchanged through the common (MC) placenta [1, 3]. To date, there is no report on MC DZT exhibiting blood group chimerism in Korea. There has been only one reported instance of blood group chi- merism in a dizygotic dichorionic pregnancy, even though IVF- ET is widely used in Korea [2, 4]. We report blood group chime- rism in sex-discordant MC DZT conceived via IVF-ET, initially misdiagnosed at birth as having blood subgroup B3.
Abstract
Dear Editor, Monochorionic (MC) dizygotic twins (DZT) are rarely conceived naturally [1]. However, the number of pregnancies conceived by assisted reproductive technology (ART) has increased from 9,864 in 1994 to 29,733 in 2006, thus multiple birth rate in- creased from 10/1,000 live births in 1980’s to 27.5/1,000 live births in 2008 in Korea [2]. All MC DZT are theoretically chime- ric for blood cells because blood stem cells might be exchanged through the common (MC) placenta [1, 3]. To date, there is no report on MC DZT exhibiting blood group chimerism in Korea. There has been only one reported instance of blood group chi- merism in a dizygotic dichorionic pregnancy, even though IVF- ET is widely used in Korea [2, 4]. We report blood group chime- rism in sex-discordant MC DZT conceived via IVF-ET, initially misdiagnosed at birth as having blood subgroup B3.
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